Electrically controlled brake with improved anti-rotation bracket for magnet

Abstract

The electromagnet of an electrically controlled brake is prevented from rotating on its mounting pin by a bracket which also captivates the magnet against axial removal from the pin while leaving the magnet free to pivot and float axially on the pin. The bracket is made of a strip of resiliently yieldable material and includes a leg paralleling the pin and secured at one end of the magnet. The other end portion of the leg extends through a hole in the brake operating arm and is integral with a tang which engages the arm to captivate the magnet against axial removal from the pin.

We claim: 
     
       1. An electrically controlled brake comprising a support having two sides and having a hole extending therethrough, a pin projecting from one side of said support, and an electromagnet telescoped with said pin, the improvement in said brake comprising a bracket for restricting rotation of said magnet on said pin and for permitting limited axial floating of the magnet on the pin while restricting axial removal of the magnet from the pin, said bracket comprising a strip of resiliently yieldable material having a leg extending generally parallel to said pin and secured at one end portion to said magnet to float axially with said magnet, said leg having an opposite end portion projecting slidably through said hole to restrict rotation of said magnet on said pin, and a tang integral with and extending substantially perpendicular to said opposite end portion of said leg and engageable with the other side of said support to restrict axial removal of said magnet from said pin. 
     
     
       2. An electrically controlled brake as defined in claim 1 in which said electromagnet comprises a shell having two faces and having an annular groove opening out of one of its faces, said electromagnet further comprising an annular coil assembly telescoped into said groove, said coil assembly and said groove having axially facing surfaces disposed in opposing relation to one another, a slot opening out of the other face of said shell and communicating with said groove, said one end portion of said leg being located within said slot, and a second leg integral with and disposed substantially perpendicular to said one end portion of said one leg and sandwiched between said opposing surfaces of said groove and said coil assembly to restrict axial separation of said magnet and said bracket. 
     
     
       3. An electrically controlled brake as defined in claim 2 in which said groove includes an innermost radially facing side, said brake further including a tab integral with and disposed substantially perpendicular to said second leg and sandwiched between said coil assembly and the innermost radially facing side of said groove to restrict radial separation of said magnet and said bracket. 
     
     
       4. An electrically controlled brake comprising a support having two sides and having a hole extending therethrough, a pin projecting from one side of said support, an electromagnet telescoped with said pin, said electromagnet comprising a shell having two faces and having an annular groove opening out of one of its faces, said groove having an axially facing side and an innermost radially facing side, said electromagnet further comprising an annular coil assembly telescoped into said groove, a slot opening out of the other face of said shell and communicating with said groove, a bracket having one end portion secured to said magnet and having an opposite end portion projecting into said hole to restrict rotation of said magnet on said pin, said one end portion of said bracket comprising a first leg located within said slot and extending generally parallel to said pin, and a second leg integral with and extending substantially perpendicular to said one leg and sandwiched between said coil assembly and said axially facing side of said groove to restrict axial separation of said magnet and said bracket. 
     
     
       5. An electrically controlled brake as defined in claim 4 further including a tab integral with and disposed substantially perpendicular to said second leg and sandwiched between said coil assembly and said innermost radially facing side of said groove to restrict radial separation of said magnet and said bracket. 
     
     
       6. An electrically controlled brake as defined in claim 5 further including notches formed in said axially facing side and in said innermost radially facing side of said groove and receiving said second leg and said tab, respectively. 
     
     
       7. An electrically controlled brake as defined in claim 6 in which said coil assembly includes a radially projecting tongue which is received within the same said slot as said first leg. 
     
     
       8. An electrically controlled brake as defined in claim 7 in which said bracket is formed of a strip of resiliently yieldable material, and a tang on said opposite end portion of said bracket and engageable with the other side of said support to restrict axial removal of said magnet from said pin.